Turtles All The Way Down By John Green. Turtles All the Way Down is a young adult novel written by American author John Green, published on October 10, 2017, by Dutton Books. It is his fifth solo novel, and his seventh overall. Its publication was announced during VidCon 2017, the online video conference co-founded by Green and his brother Hank. Excellent creation of an OCD teenager grappling with her identity, friendship, and her place in the world. I highly recommend it.